-34.24% is the change from 771 to 507
Calculation steps:
[( 507 - 771 ) ÷ 771] x 100 = -34.24%
Formula
Percentage change = [(507 - 771) / 771] x 100
Subtract the new number by the original number
507 - 771 = -264
-264 ÷ 771 = -0.3424124513618677
-0.3424124513618677 x 100 = -34.24%